DatagramSocket Class Reference

A User Datagram (UDP) socket. More...

#include <DatagramSocket.h++>

Inheritance diagram for DatagramSocket:

Public Member Functions
	DatagramSocket (uint16_t port=0) throw ()
	Construct a new DatagramSocket.
	~DatagramSocket () throw ()
	Destructor.
void	connect (const String &addr, uint16_t port) throw (IOException)
	Connect the datagram socket to a remote endpoint.
void	connect (const SocketAddress &addr) throw (IOException)
	Connect the datagram socket to a remote endpoint.
size_t	send (const byte_t *buffer, size_t buflen) throw (IOException)
	Send a datagram to the remote endpoint.
size_t	send (ByteBuffer &buffer) throw (IOException)
	Send a datagram to the remote endpoint.
size_t	send (const byte_t *buffer, size_t buflen, const SocketAddress &dest) throw (IOException)
	Send a datagram to a given address.
size_t	send (ByteBuffer &buffer, const SocketAddress &dest) throw (IOException)
	Send a datagram to a given address.
size_t	receive (byte_t *buffer, size_t buflen) throw (IOException)
	Receive a datagram from the remote endpoint, and write it to a buffer.
size_t	receive (ByteBuffer &buffer) throw (IOException)
	Receive a datagram from the remote endpoint, and write it to a buffer.
size_t	receive (byte_t *buffer, size_t buflen, SocketAddress &source) throw (IOException)
	Receive a datagram and write it to a buffer.
size_t	receive (ByteBuffer &buffer, SocketAddress &source) throw (IOException)
	Receive a datagram and write it to a buffer.
void	setBroadcast (bool flag) throw (SocketException)
	Enable or disable broadcast.
bool	getBroadcast () const throw (SocketException)
	Determine if broadcast is enabled.
virtual void	init () throw (SocketException)
	Initialize the socket.
virtual void	shutdown () throw ()
	Shut down the socket.
void	setTimeout (timespan_ms_t timeout) throw (SocketException)
	Set the timeout for the socket.
void	setReceiveBufSize (size_t size) throw (SocketException)
	Set the size of the socket's internal receive buffer.
size_t	getReceiveBufSize () const throw (SocketException)
	Get the size of the socket's internal receive buffer.
void	setSendBufSize (size_t size) throw (SocketException)
	Set the size of the socket's internal send buffer.
size_t	getSendBufSize () const throw (SocketException)
	Get the size of the socket's internal send buffer.
void	setLingerTime (timespan_s_t timeout) throw (SocketException)
	Set the linger time for the socket.
timespan_s_t	getLingerTime () const throw (SocketException)
	Get the linger time for the socket.
void	setReuseAddress (bool enable) throw (SocketException)
	Enable or disable the SO_REUSEADDR option on the socket.
bool	getReuseAddress () const throw (SocketException)
	Determine if the SO_REUSEADDR option is enabled or disabled.
void	setKeepAlive (bool enable) throw (SocketException)
	Enable or disable the SO_KEEPALIVE option on the socket.
bool	getKeepAlive () throw (SocketException)
	Determine if the SO_KEEPALIVE option is enabled or disabled.
void	setTCPDelay (bool enable) throw (SocketException)
	Enable or disable the Nagle algorithm for send coalescing.
bool	getTCPDelay () throw (SocketException)
	Determine if the Nagle algorithm is enabled or disabled.
bool	isInitialized () const throw ()
	Determine if the socket has been initialized.
bool	isConnected () const throw ()
	Determine if the socket is connected.
NetProtocol	getType () const throw ()
	Get the socket type.
const SocketAddress &	getLocalAddress () const throw ()
	Get the address of the local end of the socket.
const SocketAddress &	getRemoteAddress () const throw ()
	Get the address of the remote (peer) end of the socket.
Static Public Attributes
static const size_t	MAX_DATAGRAM_SIZE = 16384
	The maximum size of a datagram packet.
Protected Types
enum	IOWaitMode { WaitWrite, WaitRead }
Protected Member Functions
SocketHandle	getSocketHandle () const throw ()
	Get the underlying socket handle for this socket.
void	waitForIO (IOWaitMode mode) throw (IOException)
	Wait for the socket to become ready for reading or writing.
Protected Attributes
NetProtocol	_type
	The socket type.
SocketHandle	_socket
	A handle to the socket itself.
SocketAddress	_raddr
	The remote address.
SocketAddress	_laddr
	The local address.
int	_sotimeout
	The timeout value.

Detailed Description

A User Datagram (UDP) socket.

UDP sockets are connectionless and do not provide reliable delivery. Connecting a UDP socket does not establish an actual network connection, but rather specifies the default address to which datagrams are sent and the only address from which datagrams will be received.

Author:: Mark Lindner

Member Enumeration Documentation

enum IOWaitMode [protected, inherited]

Enumerator:

WaitWrite
WaitRead

Constructor & Destructor Documentation

DatagramSocket ( uint16_t port = 0 ) throw ()

Construct a new DatagramSocket.

Parameters:

port

The local port to bind to, or 0 to bind to an arbitrary port.

~DatagramSocket ( ) throw ()

Destructor.

Member Function Documentation

void connect ( const SocketAddress & addr ) throw (IOException) [virtual]

Connect the datagram socket to a remote endpoint.

Connecting a datagram socket to an address does not actually establish a network connection, but rather restricts the socket so that it may only exchange datagrams with that address.

Parameters:

addr

The address.

Exceptions:

IOException

If an error occurs.

Reimplemented from Socket.

void connect	(	const String &	addr,
		uint16_t	port
	)			throw (IOException) `[virtual]`

Connect the datagram socket to a remote endpoint.

Connecting a datagram socket to an address does not actually establish a network connection, but rather restricts the socket so that it may only exchange datagrams with that address.

Parameters:

	addr	The address, which may either be a dot-separated IP address or a DNS name.
	port	The port number.

Exceptions:

IOException

If an error occurs.

Reimplemented from Socket.

bool getBroadcast ( ) const throw (SocketException)

Determine if broadcast is enabled.

Returns:: true if broadcast is enabled, false otherwise.

Exceptions:

SocketException

If an error occurs.

bool getKeepAlive ( ) throw (SocketException) [inherited]

Determine if the SO_KEEPALIVE option is enabled or disabled.

Returns:: true if the option is enabled, false otherwise.

Exceptions:

SocketException

If a socket error occurs.

timespan_s_t getLingerTime ( ) const throw (SocketException) [inherited]

Get the linger time for the socket.

Returns:: The linger time, in seconds, or -1 if the feature is disabled.

Exceptions:

SocketException

If the linger time could not be retrieved.

const SocketAddress& getLocalAddress ( ) const throw () [inline, inherited]

Get the address of the local end of the socket.

size_t getReceiveBufSize ( ) const throw (SocketException) [inherited]

Get the size of the socket's internal receive buffer.

Returns:: The size, in bytes.

Exceptions:

SocketException

If the size could not be changed.

const SocketAddress& getRemoteAddress ( ) const throw () [inline, inherited]

Get the address of the remote (peer) end of the socket.

bool getReuseAddress ( ) const throw (SocketException) [inherited]

Determine if the SO_REUSEADDR option is enabled or disabled.

Returns:: true if the option is enabled, false otherwise.

Exceptions:

SocketException

If a socket error occurs.

size_t getSendBufSize ( ) const throw (SocketException) [inherited]

Get the size of the socket's internal send buffer.

Returns:: The size, in bytes.

Exceptions:

SocketException

If the size could not be changed.

SocketHandle getSocketHandle ( ) const throw () [inline, protected, inherited]

Get the underlying socket handle for this socket.

bool getTCPDelay ( ) throw (SocketException) [inherited]

Determine if the Nagle algorithm is enabled or disabled.

Returns:: true if the Nagle algorithm is enabled (TCP_NODELAY off), false otherwise.

Exceptions:

SocketException

If a socket error occurs.

NetProtocol getType ( ) const throw () [inline, inherited]

Get the socket type.

void init ( ) throw (SocketException) [virtual, inherited]

Initialize the socket.

This method creates the underlying socket object.

Exceptions:

SocketException

If the socket could not be created.

Reimplemented in ServerSocket.

bool isConnected ( ) const throw () [inline, inherited]

Determine if the socket is connected.

bool isInitialized ( ) const throw () [inline, inherited]

Determine if the socket has been initialized.

size_t receive	(	ByteBuffer &	buffer,
		SocketAddress &	source
	)			throw (IOException)

Receive a datagram and write it to a buffer.

Parameters:

	buffer	The buffer to write the data to.
	source	The object in which to place the source address of the received datagram.

Returns:: The number of bytes received.

Exceptions:

IOException

If an error occurs.

size_t receive	(	byte_t *	buffer,
		size_t	buflen,
		SocketAddress &	source
	)			throw (IOException)

Receive a datagram and write it to a buffer.

Parameters:

	buffer	The raw buffer to write the data to.
	buflen	The length of the buffer.
	source	The object in which to place the source address of the received datagram.

Returns:: The number of bytes received.

Exceptions:

IOException

If an error occurs.

size_t receive ( ByteBuffer & buffer ) throw (IOException)

Receive a datagram from the remote endpoint, and write it to a buffer.

The socket must be connected before this method can be used.

Parameters:

buffer

The buffer to write the data to.

Returns:: The number of bytes received.

Exceptions:

IOException

If an error occurs.

size_t receive	(	byte_t *	buffer,
		size_t	buflen
	)			throw (IOException)

Receive a datagram from the remote endpoint, and write it to a buffer.

The socket must be connected before this method can be used.

Parameters:

	buffer	The raw buffer to write the data to.
	buflen	The length of the buffer.

Returns:: The number of bytes received.

Exceptions:

IOException

If an error occurs.

size_t send	(	ByteBuffer &	buffer,
		const SocketAddress &	dest
	)			throw (IOException)

Send a datagram to a given address.

Parameters:

	buffer	The buffer containing the data to send.
	dest	The destination address.

Returns:: The number of bytes sent.

Exceptions:

IOException

If an error occurs.

size_t send	(	const byte_t *	buffer,
		size_t	buflen,
		const SocketAddress &	dest
	)			throw (IOException)

Send a datagram to a given address.

Parameters:

	buffer	The raw buffer containing the data to send.
	buflen	The length of the buffer.
	dest	The destination address.

Returns:: The number of bytes sent.

Exceptions:

IOException

If an error occurs.

size_t send ( ByteBuffer & buffer ) throw (IOException)

Send a datagram to the remote endpoint.

The socket must be connected before this method can be used.

Parameters:

buffer

The buffer containing the data to send.

Returns:: The number of bytes sent.

Exceptions:

IOException

If an error occurs.

size_t send	(	const byte_t *	buffer,
		size_t	buflen
	)			throw (IOException)

Send a datagram to the remote endpoint.

The socket must be connected before this method can be used.

Parameters:

	buffer	The raw buffer containing the data to send.
	buflen	The length of the buffer.

Returns:: The number of bytes sent.

Exceptions:

IOException

If an error occurs.

void setBroadcast ( bool flag ) throw (SocketException)

Enable or disable broadcast.

When enabled, the socket will receive packets sent to a broadcast address and is allowed to send packets to a broadcast address.

Parameters:

flag

A flag indicating whether the feature should be enabled or disabled.

Exceptions:

SocketException

If an error occurs.

void setKeepAlive ( bool enable ) throw (SocketException) [inherited]

Enable or disable the SO_KEEPALIVE option on the socket.

Parameters:

enable

true to enable the option false to disable it.

Exceptions:

SocketException

If a socket error occurs.

void setLingerTime ( timespan_s_t timeout ) throw (SocketException) [inherited]

Set the linger time for the socket.

Parameters:

timeout

The new linger time, in seconds; a negative value disables the linger feature.

Exceptions:

SocketException

If the linger time could not be changed.

void setReceiveBufSize ( size_t size ) throw (SocketException) [inherited]

Set the size of the socket's internal receive buffer.

Parameters:

size

The new size, in bytes.

Exceptions:

SocketException

If the size could not be changed.

void setReuseAddress ( bool enable ) throw (SocketException) [inherited]

Enable or disable the SO_REUSEADDR option on the socket.

This method may only be called before the socket has been initialized. This option is off by default in newly created sockets.

Parameters:

enable

true to enable the option false to disable it.

Exceptions:

SocketException

If a socket error occurs, or if the call was made after the socket was initialized.

void setSendBufSize ( size_t size ) throw (SocketException) [inherited]

Set the size of the socket's internal send buffer.

Parameters:

size

The new size, in bytes.

Exceptions:

SocketException

If the size could not be changed.

void setTCPDelay ( bool enable ) throw (SocketException) [inherited]

Enable or disable the Nagle algorithm for send coalescing.

Parameters:

enable

true to enable the Nagle algorithm (TCP_NODELAY off), false to disable it (TCP_NODELAY on).

Exceptions:

SocketException

If a socket error occurs.

void setTimeout ( timespan_ms_t timeout ) throw (SocketException) [inherited]

Set the timeout for the socket.

The timeout affects both I/O and connections.

Parameters:

timeout

The timeout, in milliseconds.

Exceptions:

SocketException

If an error occurs.

Reimplemented in StreamSocket.

void shutdown ( ) throw () [virtual, inherited]

Shut down the socket.

Closes the connection and destroys the underlying socket object.

Reimplemented in ServerSocket, and StreamSocket.

void waitForIO ( IOWaitMode mode ) throw (IOException) [protected, inherited]

Wait for the socket to become ready for reading or writing.

Parameters:

mode

The wait mode; one of WaitWrite or WaitRead.

Exceptions:

IOException

On timeout or other error.

Member Data Documentation

SocketAddress _laddr [protected, inherited]

The local address.

SocketAddress _raddr [protected, inherited]

The remote address.

SocketHandle _socket [protected, inherited]

A handle to the socket itself.

int _sotimeout [protected, inherited]

The timeout value.

NetProtocol _type [protected, inherited]

The socket type.

const size_t MAX_DATAGRAM_SIZE = 16384 [static]

The maximum size of a datagram packet.

The documentation for this class was generated from the following files:

DatagramSocket Class Reference

Public Member Functions

Static Public Attributes

Protected Types

Protected Member Functions

Protected Attributes

Detailed Description

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation